Question

решите все это 3 номер плиз

Answer 1

1) 18+x-y-6
12+x-y
2)a-a+b=b
3)-x+y+z+x
y+z
4)-b-72+b+58=-14
5)a-(b-c-d)= a-b+c+d
6)-x+y=z+x=y= -z

Answer 2

1)18+(x-y-6)=18+x-y-6=12+x-y;
2) a-(a-b)=a-a+b=b;
3) -(x-y-z)+x=-x+y+z+x=y+z;
4) -b+(-72+b)+58=-b- 72+b+58=-72+58=-14;
5) a-(b-c-d)=a-b+c+d;
6) -(x-y+z)+(x-y)=-x+y-z+x-y=-z;